Moq: Setup a property without setter?

Question

I have following class:

public class PairOfDice {     private Dice d1,d2;     public int Value      {        get { return d1.Value + d2.Value; }     } } 

Now I would like to use a PairOfDice in my test which returns the value 1, although I use random values in my real dice:

[Test] public void DoOneStep () {     var mock = new Mock<PairOfDice>();     mock.Setup(x => x.Value).Return(2);     PairOfDice d = mock.Object;     Assert.AreEqual(1, d.Value); } 

Unfortunately I get a Invalid setup on non-overridable member error. What can I do in this situation?

Please note, that this is my first try to implement Unit-Tests.

Answer 1

You can use .SetupGet on your mock object.

eg.

[Test] public void DoOneStep () {     var mock = new Mock<PairOfDice>();     mock.SetupGet(x => x.Value).Returns(1);     PairOfDice d = mock.Object;     Assert.AreEqual(1, d.Value); } 

See here for further details.